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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
SALES AND OPERATING REVENUES: |  |  |
Other revenues |  | $ 6,363 | $ 3,763
Total sales and operating revenues |  | 361,991 | 247,666
OPERATING EXPENSES: |  |  |
Operating expenses |  | 266,608 | 198,840
Depreciation, depletion and amortization |  | 46,875 | 39,973
Asset impairment |  | 0 | 1,588
Asset retirement obligations accretion |  | 1,010 | 1,504
Asset retirement obligations change in estimate |  | 0 | (3,510)
Exploration costs |  | 651 | 482
General and administrative |  | 16,417 | 14,833
Total operating expenses |  | 331,561 | 253,710
INCOME (LOSS) FROM OPERATIONS |  | 30,430 | (6,044)
Interest expense (1) | [1] | (11,012) | (8,048)
Gain on extinguishment of debt |  | 0 | 10,000
Equity method investment income |  | 443 | 364
INCOME (LOSS) BEFORE INCOME TAXES |  | 19,861 | (3,728)
INCOME TAX EXPENSE: |  |  |
Current |  | 0 | 0
Deferred |  | 1,756 | 26
Total income tax expense |  | 1,756 | 26
NET INCOME (LOSS) |  | $ 18,105 | $ (3,754)
NET INCOME (LOSS) PER SHARE: |  |  |
Basic (in dollars per share) |  | $ 0.57 | $ (0.12)
Diluted (in dollars per share) |  | $ 0.55 | $ (0.12)
WEIGHTED AVERAGE SHARES OUTSTANDING: |  |  |
Basic (in shares) |  | 32,043 | 30,614
Diluted (in shares) |  | 33,649 | 30,614
(1) Interest Expense: |  |  |
Interest on bank debt |  | $ 7,563 | $ 8,510
Other interest |  | 715 | 0
Amortization and swap related interest: |  |  |
Payments on interest rate swap, net of changes in value |  | (867) | (3,026)
Amortization of debt issuance costs |  | 3,601 | 2,564
Total amortization and swap related interest |  | 2,734 | (462)
Total interest expense | [1] | 11,012 | 8,048
Coal Sales [Member] |  |  |
SALES AND OPERATING REVENUES: |  |  |
Revenues |  | 289,376 | 243,903
Electric Sales [Member] |  |  |
SALES AND OPERATING REVENUES: |  |  |
Revenues |  | $ 66,252 | $ 0
[1] | Interest Expense:

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- Definition Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126939881&loc=d3e62136-109447 + Details
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